混合溶剂体系中牛肝β-半乳糖苷酶催化5-氟-2'-脱氧尿苷区域选择性半乳糖基化反应  

Regioselective Galactosylation of Floxuridine Catalyzed by β-Galactosidase from Bovine Liver in Co-solvent Systems

作　　者：叶敏[1] 刘秋萍[1] 李宁[2,3] 宗敏华[2] 

机构地区：[1]华南理工大学生物科学与工程学院,广东广州510006 [2]华南理工大学轻工与食品学院制浆造纸工程国家重点实验室,广东广州510640 [3]中国科学院大连化学物理研究所催化基础国家重点实验室,辽宁大连116023

出　　处：《催化学报》2011年第6期1063-1068,共6页

基　　金：国家自然科学基金(20906032);中国科学院大连化学物理研究所催化基础国家重点实验室开放基金(N-09-08);华南理工大学中央高校基本科研业务费专项资金(2009zz0018;2009zz0026;2009zm0199)~~

摘　　要：研究了混合溶剂体系中有机溶剂种类和含量对牛肝β-半乳糖苷酶催化5-氟-2'-脱氧尿苷区域选择性半乳糖基化反应的影响.结果表明,在含10%(体积分数)有机溶剂体系中,该酶稳定性差,失活严重.减少有机溶剂含量可显著减轻其对该酶的毒害作用.然而,有机溶剂的添加对酶促糖基化反应的区域选择性的影响很小(均保持在99%以上).牛肝β-半乳糖苷酶在混合溶剂体系中的催化性能与有机溶剂的介电常数有良好的相关性,其中在含二甲亚砜(DMSO)体系中该酶催化活性最高.当体系中DMSO含量≤5%时,目标产物收率达71%.The influence of organic solvents and their contents on the regioselective galactosylation of floxuridine catalyzed by β-galactosidase from bovine liver was investigated in co-solvent systems.It was revealed that the enzyme was unstable and inactivated substantially in organic solvent （10%,v/v）-containing systems,and the detrimental impacts of organic solvents on the enzyme could be relieved remarkably by decreasing their contents.Nevertheless,the addition of organic solvents exerted no influence on the regioselectivity of the enzymatic glycosylation,which retained 99%.The catalytic performance of β-galactosidase from bovine liver correlated well with the dielectric constants of organic solvents in co-solvent systems,among which the enzyme displayed the highest activity in dimethyl sulfoxide （DMSO）-containing system.The yield of desired product reached 71% when the DMSO content was less than 5% （v/v） in the medium.

关 键 词：Β-半乳糖苷酶 糖基化反应 区域选择性 5-氟-2'-脱氧尿苷 有机溶剂 

分 类 号：TQ460.1[化学工程—制药化工]